A Christmas tree is seen on top of the Aegibong Peak Observatory just south of the demilitarised zone (DMZ) separating the two Koreas in Gimpo, west of Seoul December 21, 2010. South Korean military allowed Christians to erect a Christmas tree on Tuesday on top of the observatory controlled by South Korean marines, which is located about 3 km (1.9 miles) south of North Korean territory, while the North warned against it, according to local media. REUTERS/Jo Yong-Hak (SOUTH KOREA - Tags: MILITARY RELIGION)